Agastache 'Astello Indigo'

RHS Plant Profile

giant hyssop 'Astello Indigo'

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Herbaceous Perennial

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A compact and bushy, upright herbaceous perennial with aromatic, dark green, oval to lance-shaped leaves and slender whorled spikes of tubular two-lipped deep blue flowers which are very attractive to pollinators all through summer to autumn

Position

Full sun

Soil Types

Chalk, Clay, Loam, Sand

Max Height

0.5-1 metres

Max Spread

0.5-1 metres

Size

Time to Maturity: 2–5 years
Max Spread: 0.5-1 metres
Max Height: 0.5-1 metres

Growing Conditions

Chalk Clay Loam Sand

Moisture: Moist but well–drained or Well–drained
pH: Acid or Alkaline or Neutral

Position

Full sun

Aspect: East–facing or South–facing or West–facing
Exposure: Exposed or Sheltered
Hardiness

Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

H1A: under glass all year (>15C)
H1B: can be grown outside in the summer (10 - 15)
H1C: can be grown outside in the summer (5 - 10)
H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
H4: hardy through most of the UK (-10 to -5)
H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
H6: hardy in all of UK and northern Europe (-20 to -15)
H7: hardy in the severest European continental climates (< -20): H5
Drought Resistance: Yes

Colour & Scent

Fragrance Foliage

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Lamiaceae
Native to GB/Ireland: No
Foliage: Deciduous
Habit: Clump forming
Genus: Agastache are herbaceous perennials with simple, aromatic leaves and small 2-lipped tubular flowers in whorls forming dense spikes, in summer and autumn; some are rather tender but can be grown as annual bedding
Name Status: Accepted

How to Grow

Cultivation

Will grow well in well-drained soil preferably in full sun. Although a drought tolerant plant, it might need watering in extreme dry weather spells

Propagation

Propagate by seed or by division in spring

Suggested planting locations and garden types

Wildlife gardens
Patio and container plants
Cottage and informal garden
City and courtyard gardens
Low Maintenance
Flower borders and beds

Pruning

Deadhead throughout the season to encourage more flowers

Pests

Generally pest-free

Diseases

May be susceptible to powdery mildews